Carburetion system.



- S. l. PRESCOTT.

GARBURETION SYSTEM.

APPLICATION FILED FEB. 4| 1915.

1,208.20? Patented. Dec.12,1916.

" ZiSHEETS-SREETI.

ATTEST xWVE/VTDR 3 1. PRESCOTT CARBURETION SYSTEM.

APPLICATION FILED FEB. 4. 1915.

VZZS? S, I. PRESCOTT. CARBUHETION SYSTEM.

MPLICATION FILED FEB. 4. 1 15.

1,208,207. Patented Dec. 12, 1916.

3 SHEETS-SHEET 3- of air flowing locity throughout the suction stroke ofthe PATENT OFF1UE.:

SYDNEY IaPRglEZQCOTT, OF BROOKLYN, NEW YORK.

oAiiBURE'rmN SYSTEM.

Zo all whom it may concern:

Be it known that I, SYDNEY a. citizen of the United States, Brooklyn, county of Kings, and New York, have invented a new ful Improvement in Carburetion Systems, of which the following is a specification.

This invention relates to an mprovement in carburetion systems, particularly to those adapted for use in connection with power plants of automobiles, motor boats, etc.

In carburetion systems heretofore known the suction established by anengine is relied upon to effect the carburetion of air drawn into the engine during a suction stroke. During the suction stroke, the suction varies because of the variation of piston speed during the stroke' Since this suction varies, the velocity of the air also varies and the eliiciency of the carbureting mechanism varies in accordance therewith. This is true whether the engine be of the single cylinc er or of the multi-cylinder type. In allcases the carburetion is effected by a pulsating current of air, each pulsationbeing variable. f

One of the objects of the present inven- I. P'nnsoo'rr, residing at State of and usepecificati0n of Letters Patent.

tion is the production of a carburetion system comprising a carl'iuretcr including operative connections and a source of fuel supply, and means for maintaining a current of air at substantially constant velocity, at the source of fuel supply during the suction stroke of an engine in connection withwl iich the device is used so that carburetion will depend, not upon the variable pulsations heretofore relied upon, but upon-a current at substantially constant veengine.

In carburction systems heretofore used, 1t has frequently been found dlihcult to insure a full charge of explosive in the cylinder or cylinders oi an engine because the suction established by the engine is relied upon for supplying the charge of gas, and any leak in the intake manifold or piston fittings, or stream resisting obstructions due to faulty design or construction, interfere With the How of gas from the carbureting device to the engine cylinders, and in consequence an Patented Dec. 12, 1.916.

Applicatioii filed February 4, 1915. Serial No. 6,025.

uncertain supply of gas reaches the :cylinders. i

It is another object of the inventio'nto produce a carburetion system in which a definite quantity of gas is delivered to the cylinders of the invention during the normal. operation of the same, this quantity substantially equaling in volume the normal capacity of the cylinders, although it may be varied it dcsired.

Another object of the invention is the prmlucti'on of a carburetion system in which a current or blast producing mechanism is employed, this mechanism being adapted to deliver a definite quantity of air to the engine cylinders and being itself adapted to be controlled by the engine in connection with which it isused, so that the blast will vary in volume in accordance with variations of engine speed. Means for carhureting the air are also used in connection therewith Another object of the invention is the production of a carburction system in which an air blast mechanism is used, this mechanism receiving the air from air means and forcing the heated air through a carburetor to the cylinders of an engine.

Another ohject of the invention is the production'of a carburetion system unitary in construction; that is to say, having an air current or bl'ast producing means inbuilt with the carbureting means.

\Vith these and other objects not specificallyn'ientioned in view, the invention consists in "certain parts, constructions and combinations which willbe hereinafter fully described and then specifically pointed. out in the claims hereunto appended.

In the accompanying drawings, which form a part of this specification and in whichlike characters of reference indicate the same or like parts, Figure 1 is a plan view, partly in section, of a. device constructed in accordance with the invention; Fig. 2 is a side elevation of the device illustrated in Fig! 1, this figure being also shown partly in section; and Fig. 3 is a diagrammatic view indicating the application of the device to an engine.

In carrying the invention into effect, there is provided means for maintaining a; current heating reting means are used.

of air at substantially constant velocity at a source of fuel supply during the suction stroke of an engine in connection with which the device is used. hile this current maintaining means may, in some constructions, consist of a current inducing device; in the best constructions, it will consist of a device for forcing a. current of air, or in other words-producing a blast ofaira There is further provided. in the best constructions, operating means for the current maintaining means, this operating means being controlled by the engine in connection with which the device is used, so that the current or blast of air will vary in accordance with variations ot'engine speed. In the best constructions also. the capacity of the blast producing means. or other current maintaining means. will ibe substantially equal to the normal capacity of the engine cylinders. so that the device will be cflicicntly operative irrespective of the condition of the intake mechanism. piston fittings and other ele ments heretofore relied upon for filling the I cylinders with gas. In tllebest constructions also. there is providedmeans for maintaining and delivering a blast ofair tU'tllQ cylinders of an engine during the normal operation of the same and means for carbu retiug the air. the carbureting means being located between the blast maii'ltaining means andthe engine. In the best constructions also, a float carburcter will beused in the system, and means for heatingthe air will also be. provided. In those constructions where a blast maintaining means and carbusaid means may be inbuilt to form a unit. All of the above elements may be varied in construction within wide limits.

The device selected to illustrate the invention is but one of many possible concrete embodiments oi. the same. and the invention therefore is not to be restricted to the precise details of the structure shown :ll'ltlllkStflllJEll. Moreover, certain parts of the invention are "capable of use independent of other parts. and such independent use is contemplated.

In the device selected to illustratethe in vention, a blast producing device is employed which includes a fan 1' of the sirocco ty 'ie, mounted upon a shaft :2. which shaft carries a pulley 3. \Yhile in certain constructions this fan may be driven from any suitable source of power, yet it is adapted to bedriven or controlled by an engine in connection with which the device is used, so that the speed of the fan-and consequently its capacitywill vary in accordance with variationsof the engine speed. A belt 4 is provided for this purpose which runs over the pulley 3 and also over any suitable rotating, part of the engine (not shown), or of any .other-suitable source-0f motion. The fan 1 is inclosed in a casting 5. The rear of this casting is closed by a plate 6 which carries a boss 7 in which the shaft 2 is journaled. The front'of intake 9 formed thereo The two plates 6 and 8 are held in position by a series of through bolts 10 extending through the casting 5 and the plates 6 and 8. i

The fan is adapted to draw air in through the intake 9 and deliver it tangentially in a steady current or blast. and the delivered blast may be conducted to an} desired point, and means for carburcting th air may be located on either side of the blast'maintainiug means. In the device selected to illustrate the invention. however. the blast maintaining means is inbuilt with the carbureting means and although other carburcters may be combined with a blast nmintaining means. whether or not the two mechanisms are inbuilt. the carburetor shown as inbuilt with the blast maintaining means forms the subject matter of my co-pcllding application. Serial No. RT-HH'Q. filed December 1, 1914, and reference made to said application for a full disclosure of the purposes, mode of operation and construction of such carbureter. For present purposes. it is sullicicnt to note that the carburetor includes movable intalge amplifiers 12 and 13 which form an intake of variable capacity; a fuel nozzle 52 located between the. amplifiers;

and an air nozzle 67 located within the fuel nozzle. The carburcter further includes a throttle shaft- -H, a throttle lever 50. stop a rm's l6, and adjusting screws -li'. For the purpose of providing easy access to the fuel nozzle 52 and air nozzle (37. the casting 5 is provided with an opening which is normally closed by a plug 11 held in position by one or more screws H. 1

By an inspection of Fig. it will be readily understood that the blast produced by the-fan 1 is delivered directly through the intake of the carhureter between the amplifiers l2 and 13. It will also be readily understood that a portion of the blast goes directly through theaii' nozzle 67, and that fuel issuing from the fuel nozzle will be in the form of an exceedingly thin tubular the casting is partially closed by a plate 8 having an air stream having air in'contact with its interior as well as with its exterior, so that the greatest possible surface ot fuel will be directly exposed to air flowing at constant velocity whenever the engine is running at constant speed.

el urine to the. evlinders of an engine shown dia grammatically in Fig. 3 and marked 1b.

. For the purpose of lieating-the air to insure high elliriency, there is provided a pipe 17, one end of which slips into the intake 9 bet'ore referred to, and the other end o'l' which is in open rommuniration with a heater in of well known construct-ion. surrounding an exhaust pipe ll), which exhaust pipe is connected with an exhaust manifold 20in commuuiration with the engine cylinders.

It will be readily understood that the tan 1 draws the heated air through the heater 1H and pipe 17 into forces the heated air through the earbureter to the cylinders oi an engine. portion of the suction stroke of an engine in which the suction is low due to the low speedof the piston, the blower or blast maintaining means maintains the necessarylvelocity at the source of .fuel supply 0 at the delivery end of the fuel nozzle, the gas ahead of it being slightly compressed in the intake manifold. At that portion of the piston travel, during the suction stroke, at which it travels at its highest speed, this slight pressure is relieved. Since the capacity of the blast maintaining means is substantially equal to the normal capacity of the engine cylinders, and since the velocity of the air past the fuel nozzle is substantially constant irrespective of the speed of the piston or pistons during the suction stroke, the efiectivc result is the production of ,a. more uniform gasthan has heretofore been possible, and-also the delivery to the cylinders of the engine of a full charge of gas irrespective of defects due to faulty design, or to .Wear,or

. to weather conditions.

As above pointedout, the air may be, car- ,bureted before it passes through the blast maintaining means; and in such case,"the blast maintaining means would operateupon gas and not upon air. Any suitable means may be employed for carbureting the a1r,

irrespective of its location. Any suitable means may be employed for heating the air .before'it is carl'au'eted orfor heating theresultant gas after it carbureted.

' What isclaimed is 1. In a earburetion system, the combinaits own interior, and then During that take, and means-for tion with an air intake having (o-acting rocking members provided with cooperating circumferential progressively expanding grooves semi-rircular in cross section, said members being 0 wrative .by a current of air establisbei'l (hare etween and actingthereupon to vary the amplitude of the passage between said members in accordance with variations in the air current, of a manifold ronluvted and.coiiperative with said air inlake. and means for producing and deliverine; a blast of air to the intake substantially equal in volume to the normal capacity of the canine. cylinders in connection with which the device is'used and in such manner as to-raus|.-'the'air blast to cotiperate with the e inc suction in ope ating and'controtting the operation ot said rocking mem bers connected and coiiperative with said air in take. and'a blower and operative connections for producing and delivering a blast of air to the. intake substantially equal in volume to the normal capacity of the engine cylinders in connection with which the device is used and in such manner as to cause the air blast to roiiperate with the engine suction in operating and Controlling the operation of said rocking members.

3. In a carburetion tion with an air rocking members provided with cooperating circumferential progressively expanding grooves semi-circular in cross section said system, the combinamembers being operative by a current of air established therebetween and acting thereupon to vary the amplitude of the passage bet v'een said members in accordance with variations in the air current, of a manifold connected and cooperative with said. airinproducing and deliven ing-a blast of air to ,t-he intake in such manner as to cause the air blast to cooperatewith theengine suction in operz'tt'ing and intake having 'co-acting All controlling the operation of said. rocking members, said means controlled by which the device is used whereby the blast varies in volume in accordance with vai-ia'- tions of engine speed.

a. In a carburetion system, the eombimn tion with an airi intake having 0()--HCtlflg being adapted to be; the engine in connection with I rocking membersprovided with cooperating circumferential progressively expanding grooves semi-circular in cross section said members being operative by a current of air aljilished thcrebetween and acting thureu mn to vary the amplitude of the pas- V between said members in accordance u 1th i'old connected and coiiperativc with said air intake. and a blower and operative connections for producing and delivering a blast oi air to the intake substantially equal in volume to the normal capacity of the engine cylinders inconnection with which the device is used and in such manner as to cause the blast of air to coiiperate with the engine suction in operating and controlling the operation of said rocking members. said )lowcr being. adapted to be controlled by the engine in connection with which the device is used whereby the blast is varied in volume in accordance with variations of engine. speed.

5. In a carburetor, the combination with an air intake having co-aeting rocking members provided with cooperating circumfer i-ntial progressively expanding grooves semicircular in cross section said members being operative by suction established there between and acting thereupon to vary the amplitude of the passage between the memhers in accordance with suction variations, of a. fuel nozzle located between said men1- hers and concentric with the grooves thereof, an air nozzle within said fuel nozzle, and means for producing and delivering a blast of air to the intake and through the air nozalcsubstantially equal in volume to the normal capacity of the engine cylinders in connection with which the device is used.

6. In a carburetor, the combination with an air intal te having cooperating rocking members provided with cobpcrating circunr ferential progressively ex 'ianding grooves semi-circular in cross section said members being operative by suction established there between and acting thereupon to vary the amplitude of the passage between the memhers in accordancenvith suction variations, of a fuel nozzle located between said members and, concentric with the grooves thereof, an air nozzle within said fuel nozzle. and ablower and operative connections for producing and delivering a blast of air to the. intake and through the air nozzle substan'tially equal i'n volume to the normal :af-ac-ity of the engine cylinders in connection with which the device is used.

'F. In a carburetor, the combination with on. air intake. having enacting rocking; memi-e'rs provided with cooperating circumferential progressively expanding grooves semi-circular in cross section said members being opcraiive by suction established therebetween and acting, thereupon to ,vary the amplinule ofthc passage between the menr hers in accordance with suction variations,-

variations in the air current, of a maniof a -fuel nozzle located between said members and concentric with the moves there of, an air nozzle within said fuel nozzle, and means for producing and delivering a blast of air to the intake and through the air nozzle said means being adapted to be controlled by an engine in connection-with which the device is used whereby the volume of air delivered varies in accordance with variations of engine speed. I

8. In a, carburetor, the combination with an air intake having co-acting rocking members provided with cooperating circumferential progressively expanding grooves semi-circular in cross section said members being operative by suction established thcrebetwcen and acting thereupon to vary the amplitude of the passage between the members in accordance with suction variations of a. fuel nozzle located between said members and concentric with the grooves thereof, an air nozzle within said fuel nozzle, and a blower and connections for prm dueiug and delivering a blast of air to the intake and t-l'irough the air nozzle said blower and connections being adapted to be controlled by an engine in connection with which the device is used whereby the volume of air delivered varies in accordance with variations of engine speed.

9. In a carburetor, the combination with an air intake having C-a0ting rocking members provided with cooperating Cil(lIl1lferential progressively expanding grooves semi-circular in cross section said members being operative by suction established therehetwcen and acting thereupon to var the amplitude of the passage between the members in accordance with suction variations, of means for producing and delivering a blast of air to the intake substantially equal in volume to the normal capacity of the engine cylinders in connection with which the device is used, and means for preheating the air.

10. In a. oarburetion system, the combinati0n-with an air intake provided with movable means operative by acurrcnt of air estahlishedin the intake and acting upon said means to vary the amplitude of the intake in accordance with air current variations, of a, manifold connected and coiperative with said air intake, and means for producing and delivering a blast of air to the intake to cause the manifold to act -as an accumulator and the air blast to compensate for fluctuation in the engine suction and control the movement of said movable means.

11. In. acarburetion system, the combination with an air intake provided with a pair of coasting movable members operative by a current of air cstalihshed in the intake and acting upon saul members to vary the amplitude of the air intake in accordance with air current variations, of a manifold connected and cooperative with said air intake, and means for producing and delivering a blast of air to the intake substantially equal in volume to the normal capacity of the engine cylinders in connection with which the device is used to cause the manifold to act as an accumulator and the air 10 blast to cooperate with the fluctuating en-' g'ine suction in maintaining a constant force acting upon and for controlling the movement of said movable members.

In testimony whereof, I have signed my name to this specification in the presence of 15 two subscribing Witnesses.

SYDNEY I. PRESCOTT. Witnesses:

ELIZABETH LOUISE RUSSELL, JAMES A. MCCANN. 

